I don't know about Modern Linear, but vxb sells double-v at a good price. No track though.
V Groove Bearings:Ceramic,Miniature Ball Bearings
Is there a difference between Bishop-Wisecarver and Modern Linear products, other than the pricing? Modern Linear is almost half the cost of Bishop-Wisecarver dual- vee wheels, and even less on the bushings. I know "you get what you pay for", but I am on a very limited budget, but also want quality.
I was looking for larger sizes (4XXL), they don't seem to list them.
Also been looking for a good price on these bearings & track, as I'm wanting too use very small ones for a floating z axis. Problem I have is there isn't many suppliers of these in Australia. The ones there are , are very expensive.